CHEMISTRY 113 EXAM 4(A)

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1 Summer The molecular geometry of PF 4 + ion is: A. bent B. trigonal planar C. tetrahedral D. octahedral CHEMISTRY 113 EXAM 4(A) 2. The Cl-C-Cl bond angle in CCl 2 O molecule (C is the central atom) is: A. less than 120 o B. 90 o C o D. greater than 120 o 3. Indicate which of the molecules below is polar A. I 2 B. SeF 4 C. CH 4 D. SbF 5 4. The hybridization on the entral atom in XeF 4 is A. sp 3 d 2 B. sp 3 C. sp 2 D. sp 5. Which of the following molecules will exhibit delocalized bonding: A. N 2 B. CO 2 C. NO 3 - D. NH The C-C σ bond in ethylene results from overlap of

2 A. p atomic orbitals B. s atomic orbitals C. sp 3 hybrid orbitals D. sp 2 hybrid orbitals 7. Of the following, indicate the correct statement of Boyle s law: A. V = Constant x T B. PV = Constant C. P/V = Constant D. P = Constant x V 8. The volume of an ideal gas is zero at: A. 0 K B. 0 o C C. 273 K D. 72 K mol of an ideal gas occupies 57.9 L at 300 K and 1 atm. The volume of this gas at 353 K and 2 atm will be: A L B L C L D L 10. The amount of gas that occupies L at 31 o C and 367 torr is A mol B mol C mol D. 2.3 mol 11. A vessel contains N 2, Ar, He, and Ne. The total pressure is 987 torr. The partial pressures of nitrogen, argon, and helium are 44, 486, and 218 torr, respectively. The partial pressure of neon is

3 A. 760 torr B. 521 torr C torr D. 239 torr 12. The average kinetic energy of the particles of a gas is directly proportional to: A. temperature B. the rms speed C. the particle mass D. the square of the particle mass 13. According to kinetic-molecular theory, in which of the following gases will the root-meansquare speed be the highest at 200 o C? A. SF 6 B. H 2 O C. HCl D. Cl The root-mean-square speed of methane at 113 o C is: A. 586 m/s B. 767 m/s C. 3x10 8 m/s D m/s 15. Which of the following exhibit dipole-dipole attraction between molecules? A. CO 2 B. XeF 4 C. Cl 2 D. NH Which substance of the following list will have the highest boiling temperature? A. CH 4

4 B. SiH 4 C. GeH 4 D. SnH The vapor pressure of a liquid at its normal boiling temperature is: A. 1 Pa B. 1 atm C. 1 torr D. equal to the vapor pressure of water 18. Which of the substances below will have hydrogen bonds as one of its intermolecular forces? A. CH 2 Cl 2 B. CH 4 C. NH 3 D. PH On the phase diagram shown below point A corresponds to: A. liquid-gas coexistence B. critical point C. solid-liquid coexistence D. solid-gas coexistence 20. On the phase diagram the process along the 1 2 line corresponds to the following transformation: A. fusion B. condensation

5 C. deposition D. sublimation Summer The molecular geometry of PF 4 + ion is: E. tetrahedral F. trigonal planar G. bent H. octahedral CHEMISTRY 113 EXAM 4(B) 5. The Cl-C-Cl bond angle in CCl 2 O molecule (C is the central atom) is: E. greater than 120 o F. less than 120 o G o H. 90 o 6. Indicate which of the molecules below is polar E. SbF 5 F. I 2 G. CH 4 H. SeF 4 7. The hybridization on the entral atom in XeF 4 is C. sp D. sp 2 C. sp 3 D. sp 3 d 2 5. Which of the following molecules will exhibit delocalized bonding: E. NO 3 -

6 F. NH 4 + G. CO 2 H. N 2 8. The C-C σ bond in ethylene results from overlap of C. sp 3 hybrid orbitals D. sp 2 hybrid orbitals C. p atomic orbitals D. s atomic orbitals 9. Of the following, indicate the correct statement of Boyle s law: E. PV = Constant F. P = Constant x V G. P/V = Constant H. V = Constant x T 8. The volume of an ideal gas is zero at: E. 0 o C F. 273 K G. 0 K H. 72 K mol of an ideal gas occupies 57.9 L at 300 K and 1 atm. The volume of this gas at 353 K and 2 atm will be: A L B L E L F L 11. The amount of gas that occupies L at 31 o C and 367 torr is E mol F mol G mol

7 H. 2.3 mol 11. A vessel contains N 2, Ar, He, and Ne. The total pressure is 987 torr. The partial pressures of nitrogen, argon, and helium are 44, 486, and 218 torr, respectively. The partial pressure of neon is E torr F. 239 torr G. 760 torr H. 521 torr 12. The average kinetic energy of the particles of a gas is directly proportional to: E. the rms speed F. temperature G. the square of the particle mass H. the particle mass 13. According to kinetic-molecular theory, in which of the following gases will the root-meansquare speed be the highest at 200 o C? A. HCl E. Cl 2 F. H 2 O G. SF The root-mean-square speed of methane at 113 o C is: E. 420 m/s F. 586 m/s G. 767 m/s H. 3x10 8 m/s 16. Which of the following exhibit dipole-dipole attraction between molecules? A. XeF 4 B. CO 2 C. Cl 2

8 D. NH Which substance of the following list will have the highest boiling temperature? E. GeH 4 F. CH 4 G. SiH 4 H. SnH The vapor pressure of a liquid at its normal boiling temperature is: E. 1 torr F. 1 atm G. 1 Pa H. equal to the vapor pressure of water 18. Which of the substances below will have hydrogen bonds as one of its intermolecular forces? E. CH 4 F. CH 2 Cl 2 G. PH 3 H. NH On the phase diagram shown below point A corresponds to: E. critical point F. liquid-gas coexistence G. solid-liquid coexistence H. solid-gas coexistence

9 20. On the phase diagram the process along the 1 2 line corresponds to the following transformation: E. sublimation F. fusion G. deposition H. condensation

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